title: Development of increased bacterial resistance to antibiotics. I. Continuous spectrum of resistance to penicillin, chloramphenicol, and streptomycin.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects*; D002701:Chloramphenicol; D010406:Penicillins; D013307:Streptomycin
chemical_list: D000900:Anti-Bacterial Agents; D010406:Penicillins; D002701:Chloramphenicol; D013307:Streptomycin
keywords: ANTIBIOTICS/effects; BACTERIA/effect of drugs on